Gibson Turndown pipes
 

Is anyone running the gibson or something similar to the exaust turn down pipes, that dump the exaust under the water at idle. how well do they work. I,ve got e-tops that come out of the engine hatch and it is loud. I need to get to 88db at idle. will they work?

I have 1000 HP with Etops and added the CMi down turns. I am at 78 Dba at idle. Unfortunatley sounds like a Bayliner, but keeps the water patrol off my case.

Do you know what dimensions you need? We can get you quote. We have sold many of these.

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Kirk

my exaust comes out high on the transom, I will need at least 12" and they are 4.5" dia. what can you get me a set for?
larry

The typical is 12" down and 12" out. I havent quoted 4.5" in awhile. Will call CMI Monday for a price.

Have a great weekend.

Here you go 4.5" Gibson turn-downs. $500 plus shipping takes all four. PM me if you are interested. I paid $900 and had them on the boat for 15 hours.....decided that louder is better.:D:D

A few more pics

They are the 12" X 12" model (See Gibson's website for more details)

I only need 2, how much???

GLH here on the board is using them. pm him see how he likes them!

I started a similar thread in General Discussions before I found this one. GLH posted some pictures there.

Do you guys see any top end speed / rpm loss with the turndowns?